22-250 with R12

[257 Ackley]

I'm looking for data for two different bullets with this powder. Speer 52 grain HP and Hornady 55 grain BT.

I have an old can that has been sitting around for about 25 years and want to use it up. Anyone know what the reason was for dicontinuing this powder? This used to be my go-to powder for 50-55 grain bullets in my Ruger #1.

 

[FOTIS]

Cartridge : .22-250 Rem. (SAAMI)
Bullet : .224, 52, Speer HP 1035
Cartridge O.A.L. L6: 2.350 inch or 59.69 mm
Barrel Length : 26.0 inch or 660.4 mm
Powder : Alliant Reloder-12

Predicted data by increasing and decreasing the given charge,
incremented in steps of 3.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-30.0 59 22.40 2559 756 19026 5516 86.8 1.535
-27.0 61 23.36 2655 814 20817 5823 88.9 1.485
-24.0 64 24.32 2750 873 22766 6122 90.7 1.438
-21.0 66 25.28 2845 935 24887 6409 92.5 1.393
-18.0 69 26.24 2939 998 27197 6684 94.0 1.350
-15.0 71 27.20 3033 1062 29673 6943 95.5 1.308
-12.0 74 28.16 3126 1128 32318 7185 96.7 1.268
-09.0 76 29.12 3218 1196 35176 7408 97.7 1.230
-06.0 79 30.08 3309 1264 38268 7611 98.6 1.189
-03.0 81 31.04 3399 1334 41609 7790 99.2 1.145
+00.0 84 32.00 3487 1404 45219 7945 99.7 1.103
+03.0 86 32.96 3574 1475 49122 8076 99.9 1.063
+06.0 89 33.92 3659 1546 53340 8180 100.0 1.026
+09.0 91 34.88 3742 1617 57901 8271 100.0 0.990 ! Near Maximum !
+12.0 94 35.84 3824 1689 62837 8360 100.0 0.956 ! Near Maximum !
+15.0 96 36.80 3904 1760 68183 8444 100.0 0.924 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 84 32.00 3618 1512 52920 7704 100.0 1.030
Data for burning rate decreased by 10% relative to nominal value:
-Ba 84 32.00 3301 1258 37621 7871 95.8 1.198